Excited Fermion Contribution to Z Physics at One Loop

Details Excited Fermion Contribution to Z Physics at One Loop Excited Fermion Contribution to Z Physics at One Loop

1996-08-13

arxiv.org/abs/hep-ph/9608309v1

Nucl.Phys. B486 (1997) 3-22

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages 6 figures

Scientific paper

10.1016/S0550-3213(96)00651-7

We investigate the effects induced by excited leptons at the one-loop level in the observables measured on the $Z$ peak at LEP. Using a general effective Lagrangian approach to describe the couplings of the excited leptons, we compute their contributions to both oblique parameters and $Z$ partial widths. Our results show that the new effects are comparable to the present experimental sensitivity, but they do not lead to a significant improvement on the available constraints on the couplings and masses of these states.

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